Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/13—Phenols; Phenolates
  • C08K5/134—Phenols containing ester groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/49—Phosphorus-containing compounds
  • C08K5/51—Phosphorus bound to oxygen
  • C08K5/53—Phosphorus bound to oxygen bound to oxygen and to carbon only
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/06—Polystyrene

Definitions

• the present invention does not impair heat resistance, mechanical strength, etc., and further, has no cloudiness or light transmittance reduction, has a good hue and brightness, and a light guide plate formed by molding the same.
• the present invention relates to optical molded products such as illuminant materials and nameplates.
• a surface light source device is incorporated in a liquid crystal display device in order to cope with demands for thinning, lightening, power saving, high luminance and high definition.
• This planar light source device is provided with a light guide plate having a wedge-shaped cross section having a uniformly inclined surface.
• a proposal has also been made to provide a light scattering function by forming a prism-shaped uneven pattern on the inclined surface (Patent Document 1).
• the light guide plate is generally obtained by injection molding of a thermoplastic resin, and the above concavo-convex pattern is given by transferring the concavo-convex pattern formed on the mold surface.
• the light guide plate has been formed from a material such as polymethyl methacrylate (PMMA).
• PMMA polymethyl methacrylate
• the heat generated inside devices such as personal computers, mobile phones, and PDAs tends to increase, and the thermoplastic resin used has high heat resistance in order to cope with the lighter, thinner and smaller devices, and Resins having high mechanical strength are demanded, and PMMA is being replaced with polycarbonate resins.
• Polycarbonate resin is superior to PMMA in mechanical properties, thermal properties, and electrical properties, but slightly inferior in light transmittance. Therefore, in the case of the planar light source device using the polycarbonate resin light guide plate, there is a problem that the luminance is lowered as compared with PMMA.
• Patent Document 2 a method of using a fluorescent whitening agent and a bead-shaped cross-linked acrylic resin in combination, improving luminance with a fluorescent whitening agent, and reducing unevenness in luminance with a bead-shaped cross-linked acrylic fine particle, And a method for improving light transmittance and luminance by adding an alicyclic epoxy resin, and Patent Document 4 proposes a method for improving luminance by introducing copolyestercarbonate to improve the transfer of uneven patterns. Has been.
• JP-A-10-55712 Japanese Patent Laid-Open No. 9-20860 JP-A-11-158364 JP 2001-215336 A
• the present invention does not impair the original properties of polycarbonate resin, that is, heat resistance, mechanical strength, and the like, and further, has no hue and light transmittance, and has good hue and brightness, and molding the same.
• Optical molded products such as a light guide plate, a surface light emitter material, and a name plate are provided.
• the polycarbonate resin contains a polystyrene resin and a specific antioxidant, so that there is no decrease in white turbidity or light transmittance, hue and brightness.
• the present invention was completed by finding that an optical molded article such as an excellent light guide plate can be obtained.
• the present invention relates to 100 parts by weight of a resin component comprising 97 to 99.95% by weight of a polycarbonate resin (A) and 0.05 to 3% by weight of a polystyrene resin (B) having a weight average molecular weight of 1000 to 18000,
• the present invention relates to a polycarbonate resin composition comprising 0.02 to 2 parts by weight of an antioxidant (C) and / or a phenolic antioxidant (D), and an optical molded article such as a light guide plate comprising the polycarbonate resin composition.
• the polycarbonate resin composition of the present invention is excellent in luminance, light transmittance, mechanical properties, heat resistance and hue stability, the hue is also obtained in the molding of a thin (about 0.3 mm thick) light guide plate. It does not change or the resin itself deteriorates, and the industrial utility value is extremely high.
• the polycarbonate resin (A) used in the present invention is obtained by a phosgene method in which various dihydroxy diaryl compounds and phosgene are reacted or a transesterification method obtained by reacting a dihydroxy diaryl compound and a carbonate such as diphenyl carbonate.
• a typical example is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).
• dihydroxydiaryl compound examples include bisphenol 4-, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3) -Tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis ( Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1 Bis (hydroxyaryl) cycloalkanes such as bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4
• piperazine dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl, and the like may be mixed and used.
• Trihydric or higher phenols include phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6-dimethyl-2,4,6-tri- (4 -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like.
• the viscosity average molecular weight of the polycarbonate resin (A) is usually 10,000 to 100,000, preferably 12,000 to 25,000, and more preferably 12,000 to 18,000. In producing such a polycarbonate resin, a molecular weight regulator, a catalyst and the like can be used as necessary.
• the weight average molecular weight of the polystyrene resin (B) used in the present invention is 1000-18000.
• the weight average molecular weight of the polystyrene resin (B) is less than 1000, the light transmittance is inferior.
• the weight average molecular weight exceeds 18000, the light transmittance and the haze ratio are inferior. More preferably, it is in the range of 1500 to 10,000, and more preferably in the range of 2000 to 4000.
• the composition ratio of the polystyrene resin (B) is 0.05 to 3% by weight, preferably 0.1 to 1% by weight, based on the resin component comprising (A) and (B).
• the composition ratio of the polystyrene resin (B) is less than 0.05% by weight, the light transmittance and the luminance cannot be improved.
• the composition ratio exceeds 3% by weight, the light transmittance decreases and the haze increases, which is not preferable.
• polystyrene resin (B) includes JONCRYL ADF-1300 manufactured by BASF.
• Examples of the phosphorus-based antioxidant (C) and / or the phenol-based antioxidant (D) used in the present invention include the following compounds.
• phosphorus antioxidant (C) what consists of 1 type or more among the compounds represented by the following general formula 1, 2, and 3 is mentioned.
• R 1 to R 4 represent an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group.
• R 5 and R 6 represent an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and a and b represent integers 0 to 3.
• R 7 represents an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and c represents an integer of 0 to 3)
• the compound of general formula 1 is Sandstub P-EPQ manufactured by Clariant Japan
• the compound of general formula 2 is Adekastab PEP-36 manufactured by Adeka
• the compound of general formula 3 is Sumitizer P- manufactured by Sumitomo Chemical. 168 is listed as commercially available.
• examples of the phenolic antioxidant (D) include compounds represented by the following general formula 4.
• R 8 represents an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group.
• Irganox 1076 manufactured by Ciba Specialty Chemicals is commercially available.
• the blending amount of the phosphorus antioxidant (C) and / or the phenol antioxidant (D) is 0.02 to 2 parts by weight per 100 parts by weight of the resin component comprising (A) and (B). If the blending amount is less than 0.02 parts by weight, the thermal stability is poor, which is not preferable. On the other hand, when the amount exceeds 2 parts by weight, the light transmittance is lowered and the haze value is raised, which is not preferable.
• the amount is preferably 0.04 to 1 part by weight, more preferably 0.05 to 0.2 part by weight. In this range, the light transmittance does not decrease, and excellent thermal stability is exhibited.
• the method for mixing the various components of the polycarbonate resin composition of the present invention is not particularly limited, and examples thereof include mixing with a known mixer such as a tumbler or ribbon blender or melt kneading with an extruder.
• the method for molding the polycarbonate resin composition of the present invention is not particularly limited, and a known injection molding method, compression molding method, or the like can be used.
• Polycarbonate resin Polycarbonate resin synthesized from bisphenol A and carbonyl chloride SD1080 (viscosity average molecular weight: 15000) manufactured by Sumitomo Dow (Hereinafter abbreviated as “PC1”)
• PC1 Polycarbonate resin synthesized from bisphenol A and carbonyl chloride SD2000W (viscosity average molecular weight: 13000) manufactured by Sumitomo Dow (Hereinafter abbreviated as “PC2”)
• Polystyrene resin JONCRYL ADF-1300 manufactured by BASF (Weight average molecular weight: 2800, hereinafter abbreviated as “PS1”) Polystyrene (weight average molecular weight: 800) manufactured by Aldrich (Hereafter abbreviated as “PS2”.) Polystyrene (weight average molecular weight: 4000) manufactured by Aldrich (Hereinafter abbreviated as “PS3”) Polystyrene (weight average molecular weight: 13000) manufactured by Aldrich (Hereinafter abbreviated as “PS4”) Polystyrene (weight average molecular weight: 20000) manufactured by Aldrich (Hereinafter abbreviated as “PS5”) Polystyrene (weight average molecular weight: 23000) manufactured by Aldrich (Hereafter abbreviated as “PS6”.) Polystyrene (weight average molecular weight: 35000) manufactured by Aldrich (Hereinafter abbreviated as “PS1
• Phosphorous antioxidants P-EPQ made by Clariant Japan (Hereinafter abbreviated as “P-based AO1”) Adeka Corporation Adeka Stub PEP-36 (Hereinafter abbreviated as “P-based AO2”.) P-168 manufactured by Sumitomo Chemical Co., Ltd. (Hereinafter abbreviated as “P-based AO3”) 4).
• Phenolic antioxidants Irganox 1076 manufactured by Ciba Specialty Chemicals (Hereinafter abbreviated as “Ph-based AO”)
• polycarbonate resin compositions having the requirements of the present invention exhibited high light transmittance and luminance, excellent hue stability and low haze value.
• Comparative Example 1 the amount of PS1 was less than the specified amount, and the light transmittance was inferior. In Comparative Example 2, the amount of PS1 was greater than the specified amount, and the light transmittance and haze value were inferior.
• Comparative Example 3 was a case where the blending amount of the phosphorus antioxidant was less than specified, and the hue stability was inferior.
• the comparative example 4 was a case where the compounding quantity of phosphorus antioxidant was more than prescription
• the comparative example 5 was a case where the compounding quantity of a phenolic antioxidant was less than prescription
• the polycarbonate resin composition having the requirements of the present invention exhibited high light transmittance and luminance, excellent hue stability and low haze value.
• Comparative Example 6 was a case where PS2 having a weight average molecular weight of 800 was used, and the light transmittance was inferior.
• PS5 having a weight average molecular weight of 20000 was used, and the light transmittance was inferior.
• PS6 having a weight average molecular weight of 23000 was used, and the light transmittance and haze value were inferior.
• Comparative Example 9 when PS7 having a weight average molecular weight of 35000 was used, the light transmittance and haze value were inferior.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Priority Applications (2)

Applications Claiming Priority (6)

Publications (1)

Family

ID=40985213

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (6)

Citations (6)

Family Cites Families (8)

• 2008
  • 2008-11-12 JP JP2008290248A patent/JP5315015B2/ja not_active Expired - Fee Related
  • 2008-11-27 CN CN200880124928.3A patent/CN101932655B/zh not_active Expired - Fee Related
  • 2008-11-27 WO PCT/JP2008/071548 patent/WO2009104321A1/ja active Application Filing
  • 2008-11-27 KR KR1020107016132A patent/KR101487049B1/ko active IP Right Grant
  • 2008-12-05 TW TW097147309A patent/TWI486389B/zh not_active IP Right Cessation

Patent Citations (6)

Also Published As

Similar Documents

Legal Events